summaryrefslogtreecommitdiff
path: root/arch/arm/mach-pxa/mfp.c
blob: 5cd3cadbbd10dd00030d52d231854f141ff002fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * linux/arch/arm/mach-pxa/mfp.c
 *
 * PXA3xx Multi-Function Pin Support
 *
 * Copyright (C) 2007 Marvell Internation Ltd.
 *
 * 2007-08-21: eric miao <eric.y.miao@gmail.com>
 *             initial version
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/hardware.h>
#include <asm/arch/mfp.h>

/* mfp_spin_lock is used to ensure that MFP register configuration
 * (most likely a read-modify-write operation) is atomic, and that
 * mfp_table[] is consistent
 */
static DEFINE_SPINLOCK(mfp_spin_lock);

static void __iomem *mfpr_mmio_base = (void __iomem *)&__REG(MFPR_BASE);
static struct pxa3xx_mfp_pin mfp_table[MFP_PIN_MAX];

#define mfpr_readl(off)			\
	__raw_readl(mfpr_mmio_base + (off))

#define mfpr_writel(off, val)		\
	__raw_writel(val, mfpr_mmio_base + (off))

/*
 * perform a read-back of any MFPR register to make sure the
 * previous writings are finished
 */
#define mfpr_sync()	(void)__raw_readl(mfpr_mmio_base + 0)

static inline void __mfp_config(int pin, unsigned long val)
{
	unsigned long off = mfp_table[pin].mfpr_off;

	mfp_table[pin].mfpr_val = val;
	mfpr_writel(off, val);
}

void pxa3xx_mfp_config(mfp_cfg_t *mfp_cfgs, int num)
{
	int i, pin;
	unsigned long val, flags;
	mfp_cfg_t *mfp_cfg = mfp_cfgs;

	spin_lock_irqsave(&mfp_spin_lock, flags);

	for (i = 0; i < num; i++, mfp_cfg++) {
		pin = MFP_CFG_PIN(*mfp_cfg);
		val = MFP_CFG_VAL(*mfp_cfg);

		BUG_ON(pin >= MFP_PIN_MAX);

		__mfp_config(pin, val);
	}

	mfpr_sync();
	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

unsigned long pxa3xx_mfp_read(int mfp)
{
	unsigned long val, flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);
	val = mfpr_readl(mfp_table[mfp].mfpr_off);
	spin_unlock_irqrestore(&mfp_spin_lock, flags);

	return val;
}

void pxa3xx_mfp_write(int mfp, unsigned long val)
{
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);
	mfpr_writel(mfp_table[mfp].mfpr_off, val);
	mfpr_sync();
	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void pxa3xx_mfp_set_afds(int mfp, int af, int ds)
{
	uint32_t mfpr_off, mfpr_val;
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);
	mfpr_off = mfp_table[mfp].mfpr_off;

	mfpr_val = mfpr_readl(mfpr_off);
	mfpr_val &= ~(MFPR_AF_MASK | MFPR_DRV_MASK);
	mfpr_val |= (((af & 0x7) << MFPR_ALT_OFFSET) |
		     ((ds & 0x7) << MFPR_DRV_OFFSET));

	mfpr_writel(mfpr_off, mfpr_val);
	mfpr_sync();

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void pxa3xx_mfp_set_rdh(int mfp, int rdh)
{
	uint32_t mfpr_off, mfpr_val;
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);

	mfpr_off = mfp_table[mfp].mfpr_off;

	mfpr_val = mfpr_readl(mfpr_off);
	mfpr_val &= ~MFPR_RDH_MASK;

	if (likely(rdh))
		mfpr_val |= (1u << MFPR_SS_OFFSET);

	mfpr_writel(mfpr_off, mfpr_val);
	mfpr_sync();

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void pxa3xx_mfp_set_lpm(int mfp, int lpm)
{
	uint32_t mfpr_off, mfpr_val;
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);

	mfpr_off = mfp_table[mfp].mfpr_off;
	mfpr_val = mfpr_readl(mfpr_off);
	mfpr_val &= ~MFPR_LPM_MASK;

	if (lpm & 0x1) mfpr_val |= 1u << MFPR_SON_OFFSET;
	if (lpm & 0x2) mfpr_val |= 1u << MFPR_SD_OFFSET;
	if (lpm & 0x4) mfpr_val |= 1u << MFPR_PU_OFFSET;
	if (lpm & 0x8) mfpr_val |= 1u << MFPR_PD_OFFSET;
	if (lpm &0x10) mfpr_val |= 1u << MFPR_PS_OFFSET;

	mfpr_writel(mfpr_off, mfpr_val);
	mfpr_sync();

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void pxa3xx_mfp_set_pull(int mfp, int pull)
{
	uint32_t mfpr_off, mfpr_val;
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);

	mfpr_off = mfp_table[mfp].mfpr_off;
	mfpr_val = mfpr_readl(mfpr_off);
	mfpr_val &= ~MFPR_PULL_MASK;
	mfpr_val |= ((pull & 0x7u) << MFPR_PD_OFFSET);

	mfpr_writel(mfpr_off, mfpr_val);
	mfpr_sync();

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void pxa3xx_mfp_set_edge(int mfp, int edge)
{
	uint32_t mfpr_off, mfpr_val;
	unsigned long flags;

	BUG_ON(mfp >= MFP_PIN_MAX);

	spin_lock_irqsave(&mfp_spin_lock, flags);

	mfpr_off = mfp_table[mfp].mfpr_off;
	mfpr_val = mfpr_readl(mfpr_off);

	mfpr_val &= ~MFPR_EDGE_MASK;
	mfpr_val |= (edge & 0x3u) << MFPR_ERE_OFFSET;
	mfpr_val |= (!edge & 0x1) << MFPR_EC_OFFSET;

	mfpr_writel(mfpr_off, mfpr_val);
	mfpr_sync();

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *map)
{
	struct pxa3xx_mfp_addr_map *p;
	unsigned long offset, flags;
	int i;

	spin_lock_irqsave(&mfp_spin_lock, flags);

	for (p = map; p->start != MFP_PIN_INVALID; p++) {
		offset = p->offset;
		i = p->start;

		do {
			mfp_table[i].mfpr_off = offset;
			mfp_table[i].mfpr_val = 0;
			offset += 4; i++;
		} while ((i <= p->end) && (p->end != -1));
	}

	spin_unlock_irqrestore(&mfp_spin_lock, flags);
}

void __init pxa3xx_init_mfp(void)
{
	memset(mfp_table, 0, sizeof(mfp_table));
}